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1966 United States Senate elections

November 8, 1966
35 of the 100 seats in the United States Senate 51 seats needed for a majority
Majority party Minority party   Leader Mike Mansfield Everett Dirksen Party Democratic Republican Leader since January 3, 1961 January 3, 1959 Leader's seat Montana Illinois Seats before 67 33 Seats after 64 36 Seat change 3 3 Popular vote 13,370,521 13,254,788 Percentage 49.6% 49.1% Swing 6.6% 6.9% Seats up 20 15 Races won 17 18
Results of the elections:      Democratic hold      Republican gain      Republican hold      No election
Majority Leader before election Mike Mansfield Democratic Elected Majority Leader Mike Mansfield Democratic